Abstract
Liposarcomas account for about 20% of all sarcomas among mesenchymal neoplasms. Myxomatous liposarcoma is a rare mediastinal tumor that seems the same as other lung disorders. The most common presenting symptoms are chest pain, dyspnea, and dysphagia. Most of the diagnostic findings are provided by radiological or postoperative histopathological tests. Surgery and chemotherapy, in some cases, are the basis of treatment. People with this condition have a higher probability of a favorable outcome if they receive an early diagnosis and treatment. We present a case of a 48-year-old male with primary mediastinal liposarcoma. The patient complained of chest pain and shortness of breath with a productive cough. Computed tomography (CT) showed a large right cystic mass on the right lower thoracic cavity. Surgery was done, and a histopathological examination of the surgical specimen confirmed the diagnosis.